Formula: CaWO4
Origin of name: for Karl Scheele, Swedish chemist
Crystal system: tetragonal
Crystal class: 4/m
Twinning: common on {110} penetration or contact
Unit cell: a =5.25 Å, c = 11.39 Å
Colour: colourless, white, gray, brownish, greenish, orange-yellow
Diaphaneity:
Luster: vitreous to adamantine
Habit: crystals octahedral or tabular, often diagonally striated, massive granular, columnar
Hardness: 4.5 to 5
Specific gravity: 6.10
Cleavage: 3; {101} distinct, {112} interrupted, {001} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with powellite, fluoresces bright bluish white to white or yellowish white under SW ultraviolet light
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